package com.shujia.spark.sql

import org.apache.spark.sql.expressions.Window
import org.apache.spark.sql.{Column, DataFrame, SparkSession}

object Demo7Burk {

  def main(args: Array[String]): Unit = {
    val spark: SparkSession = SparkSession
      .builder()
      .appName("source")
      .master("local")
      .config("spark.sql.shuffle.partitions", "1")
      .getOrCreate()

    //导入隐式转换
    import spark.implicits._
    //导入spark 所有的函数
    import org.apache.spark.sql.functions._


    spark.sql(
      """
        |
        |select explode(map(1,2,3,4,5,6,7,8)) as (k,v)
        |
      """.stripMargin).show()


    //读取数据
    val burkDF: DataFrame = spark
      .read
      .schema("burk STRING,year STRING,tsl01 DOUBLE,tsl02 DOUBLE,tsl03 DOUBLE,tsl04 DOUBLE,tsl05 DOUBLE,tsl06 DOUBLE,tsl07 DOUBLE,tsl08 DOUBLE,tsl09 DOUBLE,tsl10 DOUBLE,tsl11 DOUBLE,tsl12 DOUBLE")
      .csv("data/burk.txt")


    burkDF.printSchema()
    burkDF.show()

    /**
      * 1、统计每个公司每年按月累计收入
      *
      * 输出结果
      * 公司代码,年度,月份,当月收入,累计收入
      *
      */


    burkDF.createOrReplaceTempView("burk")
    spark.sql(
      """
        |
        |select burk,year,month,pic,sum(pic) over(partition by burk,year order by month ) as sumPic
        |from (
        |select burk,year,month,pic from burk
        |lateral view explode(map(1,tsl01,2,tsl02,3,tsl03,4,tsl04,5,tsl05,6,tsl06,7,tsl07,8,tsl08,9,tsl09,10,tsl10,11,tsl11,12,tsl12)) t as month,pic
        |) as a
        |
      """.stripMargin).show(1000)


    spark.sql(
      """
        |
        |select burk,year,month,pic,sum(pic) over(partition by burk,year order by month ) as sumPic
        |from (
        |select burk,year, explode(map(1,tsl01,2,tsl02,3,tsl03,4,tsl04,5,tsl05,6,tsl06,7,tsl07,8,tsl08,9,tsl09,10,tsl10,11,tsl11,12,tsl12)) as ( month,pic) from burk
        |
        |) as a
        |
      """.stripMargin).show(1000)


    /**
      * DSL
      *
      */
    val m: Column = map(
      expr("1"), $"tsl01",
      expr("2"), $"tsl02",
      expr("3"), $"tsl03",
      expr("4"), $"tsl04",
      expr("5"), $"tsl05",
      expr("6"), $"tsl06",
      expr("7"), $"tsl07",
      expr("8"), $"tsl08",
      expr("9"), $"tsl09",
      expr("10"), $"tsl10",
      expr("11"), $"tsl11",
      expr("12"), $"tsl12"
    )


    burkDF
      .select($"burk", $"year", explode(m) as Array("month", "pic"))
      .withColumn("sumPic", sum($"pic") over Window.partitionBy($"burk", $"year").orderBy($"month"))
      .show(1000)


    /**
      * 2、统计每个公司当月比上年同期增长率
      * 公司代码,年度,月度,增长率（当月收入/上年当月收入 - 1）
      *
      */


    burkDF
      .select($"burk", $"year", explode(m) as Array("month", "pic"))
      .withColumn("lastPic", lag($"pic", 1, 0.0) over Window.partitionBy($"burk", $"month").orderBy($"year"))
      .withColumn("p", round($"pic" / $"lastPic" - 1, 8))
      .select($"burk", $"year", $"month", $"pic", $"lastPic", when($"p".isNull, 1.0).otherwise($"p") as "p")
      .show(1000)

  }

}
